Patent US3815869A successfully refreshed from Google Patents.
US3815869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly disc valves
Assignee: BAILEY W AND CO Ltd
•
Filing: 1973-02-20
•
Granted: 1974-06-11
•
Expires: 1993-02-20
Abstract
Abstract A fluid-flow control valve comprising a body having a passageway therethrough, a butterfly disc mounted in said body and rotatable to and from a position closing said passageway, and an annular seating on the body and an annular face on the butterfly disc for sealing together when the butterfly disc closes the passageway, one of said seating and said face being formed of two side-byside annular portions of dissimilar materials and the butterfly disc being displaceable along the passageway whereby the butterfly disc will close the passageway even if one of said dissimilar material is destroyed.
Inventors
- 👤 R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:44
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/2263
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
208 words
A self-sealing fluid flow control valve comprising a body having a passageway therethrough, a butterfly disc means mounted in said body for rotation to and from a position closing said passageway and for limited axial displacement under the pressure of fluid in the passageway along the passageway, the body and the butterfly disc being provided with two sets of annular sealing seatings and faces, one set being located to each side of the butterfly disc, each set being formed by a seating on the body and a face on the disc, the seating and face of each set being arranged to seal together when the butterfly disc closes the passageway, at least one of said seatings being formed of two side-by-side annular portions of which one portion is resilient material and the other portion is metallic, said two annular portions being arranged such that in a normal closed position of the valve the face on the disc seals with said resilient annular portion of said seating and such that, in the event of said resilient annular portion being destroyed, the disc becomes displaced toward said seating by fluid pressure a distance less than said limited displacement and the face on the disc seals with said metallic annular portion.
Claim 2
Dependent Claim
208 words
A self-sealing fluid flow control valve comprising a body having a passageway therethrough, a butterfly disc means mounted in said body for rotation to and from a position closing said passageway and for limited axial displacement under the pressure of fluid in the passageway along the passageway, the body and the butterfly disc being provided with two sets of annular sealing seatings and faces, one set being located to each side of the butterfly disc, each set being formed by a seating on the body and a face on the disc, the seating and face of each set being arranged to seal together when the butterfly disc closes the passageway, at least one of said seatings being formed of two side-by-side annular portions of which one portion is resilient material and the other portion is metallic, said two annular portions being arranged such that in a normal closed position of the valve the face on the disc seals with said resilient annular portion of said seating and such that, in the event of said resilient annular portion being destroyed, the disc becomes displaced toward said seating by fluid pressure a distance less than said limited displacement and the face on the disc seals with said metallic annular portion.
Claim 3
Dependent Claim
36 words
A valve according to claim 1 wherein the butterfly disc is a double disc of two parallel disc portions separated from one another by an opening constituting part of the passageway when the valve is open.
Claim 4
Dependent Claim
31 words
A valve according to claim 1 wherein the butterfly disc is rotatable by a shaft extending from the disc through the body to the exterior thereof and coupled to rotation means.
Claim 5
Dependent Claim
67 words
A valve according to claim 3 wherein the butterfly disc is provided with a slot receiving a complementarily shaped end portion of the shaft, the slot being aligned with the passageway when the butterfly disc is closing the passageway and permitting displacement of the disc along the passageway for sealing to be effective and to close the passageway even if one of the dissimilar materials is destroyed.
Claim 6
Dependent Claim
28 words
A valve according to claim 4 wherein the diametrically opposite side of the butterfly disc from the shaft is connected to a spigot rotatably mounted in the body.
Claim 7
Dependent Claim
64 words
A valve according to claim 5 wherein the connection between the butterfly disc and the spigot is similar to said slot and complementarily shaped portion of the shaft and permits displacement of the disc along the passageway when the butterfly disc is closing the passageway for sealing to be effective and to close the passageway even if one of the dissimilar materials is destroyed.
Claim 8
Dependent Claim
25 words
A valve according to claim 3 wherein the shaft is provided with means preventing the expulsion thereof from the body by pressure within the passageway.
Claim 9
Dependent Claim
22 words
A valve according to claim 7 wherein said means on the shaft comprises a shoulder thereon cooperating with part of the body.
Claim 10
Dependent Claim
42 words
A valve as in claim 1 wherein the annular metallic portion of the seating is a metallic ring which is secured in the body and which mounts the annular resilient portion of the seating, said resilient portion being constructed of plastic material.
Claim 11
Dependent Claim
12 words
A valve as in claim 9 wherein the plastic material is polytetrafluoroethylene.
Claim 12
Dependent Claim
45 words
A valve as in claim 1 wherein both of the seatings are constructed of a metallic and an annular plastic portion mounted by its respective ring, one of the rings being fixed to the body and the other ring being removably secured to the body.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |